Dong Zhuo

He was the imperial envoy of Xi Liang. Dong Zhuo gathered troops during the struggle in the imperial palace. He made an ally of Lu Bu by giving him the Red Hare, a magnificent horse, and seized control of the court army. The ruthless Dong Zhuo took power, proclaimed himself Prime Minister, and embarked on a path of tyranny. He deposed Emperor Shao and elevated Emperor Xian and continued to pursue extremely violent policies of government as ruler. Cornered by Yuan Shao's league and desperate to maintain his power, Dong Zhuo kidnapped the Emperor, looting and setting fire to Luo Yang. He fled westward to Chang'an where he declared his new capital and secured himself. However, Dong Zhuo's minister Wang Yun tricked Dong Zhuo and Lu Bu into falling in love with the same maiden, Diao Chan, sparking a rivalry between them. He was assassinated by Lu Bu because of this rivalry.

Above paragraph courtesy of RTKweb.com